Manufacture of glowing bodies of refractory metals for electric lamps.



ANTON LEDERER, or ATZGER/SDORF,

NEAR VIENNA, USTRIA-HUNGARY.

MANUFACTURE OF GLOWING BODIES OF REFRA CTORY IMETALS FOR ELECTRIC LAMPS.

Specification of Letters Patent.

- Pa.ten ted Jan. 5, 909.

- Application filed April 3, 1906. Serial No. 309,715.

To all whom it may concern: Be-it known that I, ANTON LEDERER, a subject of the Empire of Austria-Hungary,

residing at N 0. 83, Atzgersdorf, near Vienna,

in the Province of Lower Austria and Empire of Austria-Hungary, have invented new and useful Improvements in the Manufacture of GlowingBodies of Refractory Metals for Electric Lamps, of which the following is a specification.

My invention relates to improvements in the manufacture of incandescence bodies of refractory metals for electric lamps, and its object is to expedite the reaction of the materials used and by these means to make the process of manufacture of such incandescence bodies a rapid one.

In the manufacture of metallic incandescence bodies for electric lamps, use is made in most cases of the oxid of the metal to be employed as the material of the body, this oxid being reduced to metal during the recess.

In order to facilitate the operation of orming these incandescence bodies, I roceed as follows: Assuming that the bOtlGS are to be -made of a paste consisting of a metallic oxid mixed wit carbon,for example, tungsten (lioxid or tungsten trioxid and carbon, then, according to my invention, I add to this paste a small quantity of aluminium or magnesium in a metallic state. The bodies, which may be in the form of filaments, studs or rods, are then shaped in the usual way andcaused to glow b passing electric current through them. n carrying out .the described process, reduction of the metallic oxid to metal is effected ina 'much shorter time than by the older processes, lacking the aluminium or magnesium addition. a

It has been proved by Moissan that the oxids of aluminium or magnesium formed in the process described are volatile at hi h temperature, and it follows that when the bOdlGS' are exposed to the heat of incandescence, as usually required, the added substances,'namel aluminium or magnesium, will be volatillzed, after having been converted into their oxids ilnthe process of treatment.

I have found that the best results are obtained if about 1.1 to about .5 per cent. of finely divided aluminium or magnesium are added to the paste and the mixture then formed into incandescence bodies.

It is obviousthat incandescence bodies may be manufactured in the same manner from alloys of refractory metals.

I claim as my invention ,1. The process of manufacturing metallic incandescence bodies for incandescent elec-' tric lamps, which consists in mixing an oxid of a metal, carbon and an auxiliary metal which facilitates the reduction of the metallic oxid to metal, forming incandescence bodies from such mixture, reducing the metallic oxid to the metallic state by means of an electric current passed therethrou'gh, and

volatilizing the oxid of the auxiliary metalformed in the reaction by means of the electric current.

2. The process of manufacturing metallic incandescence bodies for incandescent electric lamps, which consists in forming a paste containing the oxidof a metal, carbon and aluminum, shaping the incandescence bodies from such paste, reducing the oxid of the metal to a metallic state by transmitting electric current therethrough, and volatilizing the alumina formed in the reaction by means of the electric current.

3. The rocess of manufacturing incandescence odies for incandescent lamps, which consists in mixing with an oxid of tungsten and carbon a small percentage of a metal which facilitates the reduction of the tungsten oxid to metal, forming the. incandescence bodies from the mixture and reducing the same to a relatively pure tungsten by the transmission of an electric current therethrough.

4. The process of manufacturing metallic incandescence bodies, which consists of form ing a aste containing the metal of which the incandescence bodies is to consist in the form of an oxid with the addition of from one to five-tenths of 1% of finely divided metallic aluminum, forming the paste into the reuired shape and reducing by means of an e ectric current.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ANTON LEDERER.

Witnesses:

JQHANN LUx, ALVES/TO S. HoeUE. 

